Presenter Eddie Mair is to leave the BBC after more than 30 years, the corporation has said.
The 52-year-old, who has been a presenter on Radio 4's PM programme since 1998, will host his last show on 17 August.
He joked: "I thought this was the appropriate moment to step out and give someone else a chance, before I'm so old my sentences make no lasagne."
His successor will be announced in "due course", a BBC statement said.
Fran Unsworth, director of BBC News, said: "Eddie has delivered outstanding journalism and created a real bond with the audience through his mixture of warmth, incisive questioning and knowing when to listen in order to get the very best out of his guests.
"He is one of the outstanding broadcasters of his generation and his new employer is very lucky to have him."
Mr Mair joined PM as a regular co-presenter in 1998 before becoming the sole host in 2003.
Gwyneth Williams, controller of Radio 4, said he was "a consummate broadcaster".
She said: "You want to be in his hands when news breaks and I remember too, with respect, but also personal sadness, his conversations with Steve Hewlett during Steve's illness.
"I would like to thank him for his commitment over so many years to PM, Radio 4 and our audience."